By default, Neverland will mock the result of
navigator.geolocation.getCurrentLocation to latitude 42.31283, longitude
-71.114287. This can be overridden by sending the parameters
neverland[:latitude] and neverland[:longitude]. Error states can also be
triggered by setting neverland[:error_code].

Caveats

The implementation naievely overrides the browser's geolocation
implementation by inserting a JavaScript tag into the response.

The middleware will treat the response body as HTML. If you're using XHTML,
this could cause issues.